Blockfile: Add generics, part 1

...ava/src/net/i2p/client/naming/BlockfileNamingService.java

core/java/src/net/metanotion/io/Serializer.java

core/java/src/net/metanotion/io/block/BlockFile.java

core/java/src/net/metanotion/io/block/index/BSkipLevels.java

core/java/src/net/metanotion/io/block/index/BSkipList.java

core/java/src/net/metanotion/io/block/index/BSkipSpan.java

...ava/src/net/metanotion/io/block/index/IBSkipIterator.java

core/java/src/net/metanotion/io/block/index/IBSkipSpan.java

core/java/src/net/metanotion/io/data/IdentityBytes.java

core/java/src/net/metanotion/io/data/IntBytes.java

core/java/src/net/metanotion/io/data/LongBytes.java

core/java/src/net/metanotion/io/data/NullBytes.java

core/java/src/net/metanotion/io/data/StringBytes.java

core/java/src/net/metanotion/io/data/UTF8StringBytes.java

core/java/src/net/metanotion/util/skiplist/SkipIterator.java

core/java/src/net/metanotion/util/skiplist/SkipLevels.java

core/java/src/net/metanotion/util/skiplist/SkipList.java

core/java/src/net/metanotion/util/skiplist/SkipSpan.java